PCI-7250/51
8/16/24/32 Channels Relay Actuator & Isolated Digital Inputs

Introduction

The ACL-7250 provides 8 electro-mechanical SPDT relays and 8 opto-isolated digital inputs on a compact board.

Relay Outputs
The 8 electro-mechanical relay outputs are addressed as a single I/O byte. Four of the relays are Form C contacts
(Normally Open and Normally Closed) and the remaining relays are Normally Open. A red LED indicates each
relay's ON/OFF status for monitoring.

Relay type: single-pole double-throw (SPDT)
Contact rating: 120VAC/0.5A or 30VDC/1A
Breakdown voltage: 300V Peak AC/DC min.
Relay on/off time: 5 msec. typical
Relay Current: +12V @33mA for each relay

Isolated Inputs
The 8 opto-isolated D/I channels are used for sensing digital inputs and provide 1,000VDC for isolation can be
configured as AC Filter or Non-AC Filter by jumer settings.

Opto-Isolator: PC-814
Input Channels: 8
Input Signal: AC, don't care polarity; DC, don't care polarity
Input Voltage: 5~24VDC or AC 50~1,000Hz
Input Impedance: 1.2K ohm
Isolation Voltage: 1,000VDC channel-to-channel and channel-to-ground
Response Time: 20 µsec without AC Filter, 2.2ms with AC Filter
Power Consumption: +5V @200mA typical
+12V @270mA max. , all relays are energized

Fully Compatible with ACL-7125/PCI-7225 Series

Features

• 8 relay actuator outputs
• 8 opto-isolated digital inputs
• LEDs indicate the energized relays
• Inputs jumper selectable for AC/DC isolated input
• On-board relay driving circuits
• On-board digital input signal conditioning circuits
• Register structure compatible with ACL-725/PCL-725

PCI-7251
8 Relays & 8DI Extended Card

PCI-7251 is a 8 Relays and 8 Isolated Digital Inputs exended
baord for PCI-7250. All the functionality of PCI-7250 are the same as PCI-7250, but the PCI-7251 must be connected with
PCI-7250 and the all bus interface is controlled by PCI-7250. Up to 3 PCI-7251s can be connected with one PCI-7250, and
it can be extended the PCI-7250's DIO from 8 Di & DO to 16/24/32 DI & DO.

This design is very cost effective for the applications need many DIO channels in one computer. Also, the I/O can be
accessed 32 digital inputs or 32 digital outputs in one instruction, because we use the 32 bit PCI bus architecture.

The configuration for 8/16/24/32 Relay outputs and Isolated digital Inputs are:

Relay DOs & Isolated DIs	PCI-7250	PCI-7251	Connection
8 Relays & DIs	1	-	-
16 Relays & 16 DIs	1	1	7251 is connected with CN2
24 Relays & 24 DIs	1	2	7251s are connected with CN2, and CN3
32 Relays & 32 DIs	1	3	7251s are connected with CN2, and CN3, CN4

©1995 Circuit Specialists, Inc.